... /cm3 ≤0.87Specific Surface, cm2/g ≤8000Settling value, ml/g ≥---Top Cut(D98), μm ≤35Average Grain(D50), μm ≤16Fe, % ≤0.1Mn ... used in paper-making,plastic,rubber,paint,building material,etc. Mesh 600 Natural Heavy Calcium Carbonate in rubber industry